Costco exec Webb reports 3,526.832 shares

Executive Vice President Adam Webb reports his initial COST common stock holdings, including unvested RSUs with specified future vesting dates.

Available on EDGAR 09/10/2026 - 05:49 PM EDT Accepted by SEC EDGAR 09/10/2026 - 05:48 PM EDT Learn about SEC filing dates

The filer has since corrected this document, so the figures below are the ones originally reported and some of them may have changed. Read the amended Form 3/A for what the company says now.

Rhea-AI Filing Summary

COSTCO WHOLESALE CORP /NEW (COST) reported an initial ownership filing for Executive Vice President Adam Webb. As of August 31, 2026, he reports 3,526.832 shares of common stock held directly, including 2,726.578 unvested Restricted Stock Units. Those RSUs are scheduled to vest in two tranches on October 22, 2026 and October 22, 2027. No purchase or sale transactions are reported, and no Rule 10b5-1 trading plan is indicated. A Power of Attorney is provided as an exhibit.

Insider Trade Summary

Holdings reported, no transactions

Holdings

Insider Self Adam Webb

Role Executive Vice President

Type	Security	Shares	Price	Value
Holding	Common Stock F1	--	--	--

Holdings: Common Stock — 3,526.832 shares (Direct)

Footnotes (1)

1. F1. Includes 2,726.578 shares of common stock that are unvested grants of Restricted Stock Units ("RSUs"). The vesting schedule for the RSUs is as follows: 1,016.942 shares will vest on October 22, 2026 and 1,709.636 shares will vest on October 22, 2027.

Key Figures

Total common shares owned: 3,526.832 shares Unvested RSU shares: 2,726.578 shares RSUs vesting October 22, 2026: 1,016.942 shares +2 more

5 metrics

Total common shares owned 3,526.832 shares Direct holdings of Adam Webb following the reported position as of August 31, 2026

Unvested RSU shares 2,726.578 shares Portion of Webb’s COST holdings that are unvested Restricted Stock Units

RSUs vesting October 22, 2026 1,016.942 shares First tranche of Webb’s COST RSUs scheduled to vest on October 22, 2026

RSUs vesting October 22, 2027 1,709.636 shares Second tranche of Webb’s COST RSUs scheduled to vest on October 22, 2027

Form 3 reference date August 31, 2026 Date associated with the reported COST common stock holdings

Key Terms

Restricted Stock Units, vesting schedule, Power of Attorney

3 terms

Restricted Stock Units financial

"Includes 2,726.578 shares of common stock that are unvested grants of Restricted Stock Units"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

vesting schedule financial

"The vesting schedule for the RSUs is as follows"

A vesting schedule is a timeline that determines when someone gains full ownership of certain benefits, such as company stock or retirement contributions. Think of it like earning the right to own a gift gradually over time, rather than receiving it all at once. It matters to investors because it affects when they can fully access or sell these benefits, influencing their financial planning and decision-making.

Power of Attorney regulatory

"Exhibit 24: Power of Attorney provided herewith"

A power of attorney is a legal document that allows one person to make decisions and act on behalf of another person, often in financial or legal matters. It’s like giving someone a trusted helper or agent the authority to handle important tasks if you are unable to do so yourself. This matters to investors because it can impact how their assets are managed or transferred if they become unable to oversee their affairs.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What does the Form 3 filing for COST by Adam Webb disclose?

It discloses that Executive Vice President Adam Webb beneficially owns 3,526.832 shares of COST common stock directly as of August 31, 2026, including a significant portion in the form of unvested Restricted Stock Units scheduled to vest on future dates.

How many COST shares and RSUs does Adam Webb hold according to this Form 3?

Adam Webb reports total direct holdings of 3,526.832 COST shares, which include 2,726.578 shares represented by unvested Restricted Stock Units. The remaining shares are already vested common stock.

What is the vesting schedule of Adam Webb’s COST RSUs?

The filing states that 1,016.942 RSU shares will vest on October 22, 2026, and 1,709.636 RSU shares will vest on October 22, 2027, assuming applicable vesting conditions are satisfied.

Does Adam Webb’s COST Form 3 show any stock purchases or sales?

No. The Form 3 is an initial statement of beneficial ownership and reports only Webb’s existing holdings in COST common stock; it does not list any purchase or sale transactions.

Is there a Rule 10b5-1 trading plan mentioned in Adam Webb’s COST filing?

No. The data indicate that no Rule 10b5-1 trading plan is reported for this Form 3. The filing focuses on his current ownership position and RSU vesting schedule.

What additional document is referenced in Adam Webb’s COST Form 3?

The remarks note that an Exhibit 24: Power of Attorney is provided. This authorizes designated persons to sign certain documents on Adam Webb’s behalf related to securities filings.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0104
Estimated average burden
hours per response:			0.5

1. Name and Address of Reporting Person^*

Self Adam Webb

(Last) (First) (Middle)

999 LAKE DRIVE

(Street)

ISSAQUAH WASHINGTON 98027

(City) (State) (Zip)

UNITED STATES

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
08/31/2026

3. Issuer Name and Ticker or Trading Symbol
COSTCO WHOLESALE CORP /NEW [ COST ]

3a. Foreign Trading Symbol

5. If Amendment, Date of Original Filed (Month/Day/Year)

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Executive Vice President

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock	3,526.832(1)	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Includes 2,726.578 shares of common stock that are unvested grants of Restricted Stock Units ("RSUs"). The vesting schedule for the RSUs is as follows: 1,016.942 shares will vest on October 22, 2026 and 1,709.636 shares will vest on October 22, 2027.

Remarks:

Exhibit 24: Power of Attorney provided herewith.

	/s/ Alejandro Torres, Attorney-in-Fact	09/10/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 3: SEC 1473 (03-26)